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; parse.scm - Sassy's top level parser
; Copyright (C) 2005 Jonathan Kraut
; This library is free software; you can redistribute it and/or
; modify it under the terms of the GNU Lesser General Public
; License as published by the Free Software Foundation; either
; version 2.1 of the License, or (at your option) any later version.
; This library is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; Lesser General Public License for more details.
; You should have received a copy of the GNU Lesser General Public
; License along with this library; if not, write to the Free Software
; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
; Contact:
; Jonathan Kraut
; 4130 43 ST #C2
; Sunnyside, NY 11104
; jak76@columbia.edu
; see file COPYING in the top of Sassy's distribution directory
; module parse
; import macros api text numbers opcodes push-stacks operands intern
; import-syntax meta-lambda
; export all
(define parse-directives
(let ()
(define (process-bits int output)
(if (or (= 16 int) (= 32 int))
(sassy-bits-set! output int)
(error "sassy: bad bits" int)))
(define (process-org text-base output)
(if (and (integer? text-base)
(zero? (sassy-text-size output))
(positive? text-base))
(sassy-text-org-set! output text-base)
(error "sassy: bad org" text-base)))
(define (process-entry entry-label output)
(if (symbol? entry-label)
(begin (sassy-symbol-set! output entry-label '(scope export))
(sassy-entry-point-set! output entry-label))
(error "sassy: bad entry" entry-label)))
(define (process-include include-list output)
(for-each
(lambda (x)
(cond ((string? x) (parse-directives (read-file x) output))
((symbol? x) (parse-directives (eval x
(interaction-environment))
output))
(else (error "sassy: bad include" x))))
include-list))
(define (process-scopes scope-list scope output)
(for-each (lambda (x)
(if (eq? 'import scope)
(sassy-symbol-def-error output x))
(if (symbol? x)
(sassy-symbol-set! output x `(scope ,scope))
(error "sassy: bad scope" scope x)))
scope-list))
(define (align-to count align)
(let ((diff (modulo count align)))
(if (zero? diff)
0
(- align diff))))
(define aligner
(let ((power-of-2 (lambda (x)
(and (integer? x) (positive? x)
(zero? (logand x (- x 1)))
x))))
(meta-lambda
(and 'align power-of-2))))
(define (process-heap heap-list output)
(letrec
((heap-sizer
(meta-lambda
(or (and 'bytes u-dword)
(and 'words u-dword (lambda (units) (* units 2)))
(and 'dwords u-dword (lambda (units) (* units 4)))
(and 'qwords u-dword (lambda (units) (* units 8))))))
(heap-item
(meta-lambda
(or
(and ,@aligner (lambda (align)
(let ((size (sassy-heap-size output)))
(sassy-heap-size-set!
output (+ size (align-to size align)))
(when (> align (sassy-heap-align output))
(sassy-heap-align-set! output align)))))
(and ,@heap-sizer (lambda (sizer)
(sassy-heap-size-set!
output (+ sizer (sassy-heap-size output)))))
(and 'label valid-label __
(lambda (label . rst)
(let ((current-size (sassy-heap-size output)))
(sassy-symbol-def-error output label)
(sassy-symbol-set! output label '(section heap)
`(offset ,current-size) '(size 0))
(for-each heap-item rst)
(sassy-symbol-set! output label
`(size ,(- (sassy-heap-size output)
current-size))))))
(and 'begin (* heap-item))
(else (lambda (h) (error "sassy: bad heap item" h)))))))
(for-each heap-item heap-list)))
(define (process-text text-list output)
(letrec ((text-item
(meta-lambda
(or
(and ,@aligner (lambda (align)
(push-stack-align (sassy-text-stack output)
align #x90
(sassy-text-org output))
(if (> align (sassy-text-align output))
(sassy-text-align-set! output align))))
(and 'label valid-label __
(lambda (label . opcodes-or-prims)
(sassy-symbol-def-error output label)
(sassy-symbol-set!
output label
'(section text)
`(offset ,(+ (sassy-text-org output)
(sassy-text-size output))))
(sassy-symbol-set!
output label
`(size ,(handle-text-block `(begin ,@opcodes-or-prims)
output (t-make))))))
(else (lambda (opcode-or-prim)
(handle-text-block opcode-or-prim output
(t-make))))))))
(for-each text-item text-list)))
(define (sassy-reloc-set! output name section offset type patcher)
(sassy-reloc-list-set!
output (cons (make-sassy-reloc name section offset type patcher)
(sassy-reloc-list output))))
(define (process-data data-list output)
(letrec
((current-byte-size (/ (sassy-bits output) 8))
(char/str/num
(lambda (item size)
(let ((data-stack (sassy-data-stack output)))
(cond ((char? item)
(push-stack-push data-stack (char->integer item))
(push-stack-align data-stack size 0))
((string? item)
(push-stack-push data-stack
(map char->integer (string->list item)))
(push-stack-align data-stack size 0))
((number? item)
(push-stack-push data-stack
(number->byte-list item size)))
(else (lambda (i) (error "sassy: bad data" i)))))))
(handle-data-symbol
(lambda (type target value)
(when (eqv? 'rel type)
(error "no rel relocations in data section right now"
(list 'reloc type target value)))
(when (eqv? '$here target)
(set! target (sassy-data-size output)))
(let* ((offset (sassy-data-size output))
(target-value (cond ((sassy-symbol-exists-env?
output target)
=>
(lambda (x) (sassy-symbol-offset x)))
(else target)))
(a-reloc (make-sassy-reloc
(get-reloc-target target output)
'data offset type #f value current-byte-size))
(patcher (let ((p (push-stack-push->patcher
(sassy-data-stack output)
(number->byte-list value
current-byte-size))))
(lambda (new)
(p (number->byte-list new current-byte-size))
(sassy-reloc-value-set! a-reloc new)))))
(sassy-reloc-patcher-set! a-reloc patcher)
(sassy-reloc-list-set! output
(cons a-reloc (sassy-reloc-list output)))
(if (number? target-value)
(patcher (+ target-value value))
(sassy-symbol-set!
output target
`(unres ,(lambda (n) (patcher (+ n value)))))))))
(data4
(meta-lambda
(or
(and ,@symbol? (lambda (label)
(check-label-size 4 current-byte-size 'dwords
label)
(handle-data-symbol 'abs label 0)))
(and ,@custom-reloc (lambda (a-reloc)
(check-label-size 4 current-byte-size
'dwords a-reloc)
(apply handle-data-symbol (cdr a-reloc))))
(else (lambda (data) (char/str/num data 4))))))
(data2
(meta-lambda
(or
(and ,@symbol? (lambda (label)
(check-label-size 2 current-byte-size 'words
label)
(handle-data-symbol 'abs label 0)))
(and ,@custom-reloc (lambda (a-reloc)
(check-label-size 2 current-byte-size
'words a-reloc)
(apply handle-data-symbol (cdr a-reloc))))
(else (lambda (data) (char/str/num data 2))))))
(data-item
(meta-lambda
(or
(and ,@aligner (lambda (align)
(push-stack-align (sassy-data-stack output)
align 0)
(if (> align (sassy-data-align output))
(sassy-data-align-set! output align))))
(and 'label valid-label __
(lambda (label . things)
(sassy-symbol-def-error output label)
(let ((offset (sassy-data-size output)))
(sassy-symbol-set! output label '(section data)
`(offset ,offset))
(for-each data-item things)
(sassy-symbol-set! output label
`(size ,(- (sassy-data-size output)
offset))))))
(and 'locals pair? __
(lambda (locals . body)
(let ((reset! (setup-locals locals output #f)))
(for-each data-item body)
(reset!))))
(and 'dwords __ (lambda datas (for-each data4 datas)))
(and 'bytes __ (lambda datas (for-each
(lambda (x) (char/str/num x 1))
datas)))
(and 'words __ (lambda datas (for-each data2 datas)))
(and 'qwords __ (lambda datas (for-each
(lambda (x) (char/str/num x 8))
datas)))
(and 'begin (* data-item))
(else (lambda (i) (error "sassy: bad data items" i)))))))
(for-each data-item data-list)))
(lambda (directives-list output)
(letrec
((parse-expand (lambda (itm) (parse (sassy-expand itm))))
(parse
(meta-lambda
(or
,@'void
(and 'text __ (lambda lst (process-text lst output)))
(and 'heap __ (lambda lst (process-heap lst output)))
(and 'data __ (lambda lst (process-data lst output)))
(and 'import __ (lambda lst (process-scopes
lst 'import output)))
(and 'export __ (lambda lst (process-scopes
lst 'export output)))
(and 'include __ (lambda lst (process-include lst output)))
; (and 'direcs __ (lambda lst (parse-directives lst output)))
(and 'entry ? (lambda (symb) (process-entry symb output)))
(and 'org ? (lambda (int ) (process-org int output)))
(and 'bits ? (lambda (int ) (process-bits int output)))
(and 'begin (* parse-expand))
(else (lambda (err) (error "sassy: bad directive" err)))))))
(for-each parse-expand directives-list)))))
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